Polk synthesized RX
First off, since the radio just started production, they aren't available yet (expected for January). Since they don't exist yet, the pictures on the web-site are from an earlier version. Supposedly they have eliminated the need for a programming button (red button in picture), and I think they said it is compatible with ALL ppm (FM) transmitters (+ve & -ve shift).
<Quote from email> "Our system adjusts for either positve or negative pulse..."
Hope this helps.